15115220020501 has 4 divisors (see below), whose sum is σ = 15371410190400. Its totient is φ = 14859029850604.

The previous prime is 15115220020421. The next prime is 15115220020517. The reversal of 15115220020501 is 10502002251151.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15115220020501 - 2¹¹ = 15115220018453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15115220020801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128095084861 + ... + 128095084978.

It is an arithmetic number, because the mean of its divisors is an integer number (3842852547600).

Almost surely, 2^{15115220020501} is an apocalyptic number.

It is an amenable number.

15115220020501 is a deficient number, since it is larger than the sum of its proper divisors (256190169899).

15115220020501 is an equidigital number, since it uses as much as digits as its factorization.

15115220020501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256190169898.

The product of its (nonzero) digits is 1000, while the sum is 25.

Adding to 15115220020501 its reverse (10502002251151), we get a palindrome (25617222271652).

The spelling of 15115220020501 in words is "fifteen trillion, one hundred fifteen billion, two hundred twenty million, twenty thousand, five hundred one".